55011

Appears in sequences

• Numbers k such that 9^k == -1 (mod k-1).at n=9A055692
• Consider the family of multigraphs enriched by the species of directed sets. Sequence gives number of those multigraphs with n labeled edges.at n=6A099692
• Wiener index of the n X n black bishop graph.at n=21A292051
• Wiener index of the n X n white bishop graph.at n=20A292059